论文标题
平行加速对湍流Tokamak等离子体中重杂质传输的影响
Effects of the parallel acceleration on heavy impurity transport in turbulent tokamak plasmas
论文作者
论文摘要
发现并分析了湍流Tokamak等离子体中重杂质的动力学的过程。我们表明，平行的随机加速度强烈耦合到垂直转运并产生径向捏速度。该相互作用与隐藏的漂移产生，这是运动的准连续性成分，由相反方向的一对平均径向速度组成。平行的加速度打破了这种对称性，并产生径向平均速度，可以沿向内或向外方向。使用数值模拟在测试粒子模型的框架内分析钨离子在三维湍流中的转运。结果表明，加速度诱导的捏合对于在当今的tokamaks和Iter中对于W杂质运输至关重要。
A process specific to the dynamics of the heavy impurities in turbulent tokamak plasmas is found and analysed. We show that the parallel stochastic acceleration is strongly coupled to the perpendicular transport and generates a radial pinch velocity. The interaction is produced with the hidden drifts, a quasi-coherent component of the motion that consists of a pair of average radial velocities in opposite directions. The parallel acceleration breaks this symmetry and yields a radial average velocity that can be in the inward or outward direction. The transport of the tungsten ions in three-dimensional turbulence is analysed in the frame of a test particle model using numerical simulations. The results show that the acceleration induced pinch can be important for W impurity transport in present days tokamaks and in ITER.
